Maestro

Maestro is a Task Scheduler written in Golang and supported by Owlint.

The main features of Maestro are :

• Agnostic of the client and worker language
• Timeout
• Retries
• Cancel
• Cron Tasks
• Oblivious : No task payload or result is saved permanently. Your data is safe.

Dependencies

• ExentStore : An minimalist EventStore app written in Elixir
• Postgresql : As a backend for ExentStore
• MongoDB : For persistant data projections
• Redis : For non persistant data storage (Task Payload and result)

How does tasks work ?

Once a task is created, its state automaticaly evolves following the following state diagram :

Run

A .env file must exist in current directory with this content :

SECRET=CHANGEME

make docker.recreate
go run cmd/srv/main.go

Service will be bind to port 8080.

Create task

curl --request POST \
  --url http://localhost:8080/api/task/create \
  --header 'Content-Type: application/json' \
  --data '{
	"queue": "queueName",
	"retries": 3,
	"timeout": 300,
  "payload": "some-string-payload"
}'

{
  "task_id": "Task-74484551-70c0-41a1-a9f0-db36923379e2"
}

Task State

curl --request POST \
  --url http://localhost:8080/api/task/get \
  --header 'Content-Type: application/json' \
  --data '{
	"task_id": "Task-74484551-70c0-41a1-a9f0-db36923379e2"
}'

{
  "task_id": "Task-74484551-70c0-41a1-a9f0-db36923379e2",
  "queue": "queueName",
  "state": "pending",
  "last_update": 1614350994
}

If completed. When completed, the string result will be available for 5 minutes.

{
  "task_id": "Task-74484551-70c0-41a1-a9f0-db36923379e2",
  "queue": "queueName",
  "state": "pending",
  "last_update": 1614350994,
  "result": "some-string-payload"
}

Next Task in queue

curl --request POST \
  --url http://localhost:8080/api/queue/next \
  --header 'Content-Type: application/json' \
  --data '{
	"queue": "queueName"
}'

{
  "task_id": "Task-74484551-70c0-41a1-a9f0-db36923379e2",
  "queue": "queueName",
  "state": "pending",
  "last_update": 1614350994,
  "payload": "some-string-payload"
}

Complete task

curl --request POST \
  --url http://localhost:8080/api/task/complete \
  --header 'Content-Type: application/json' \
  --data '{
	"task_id": "Task-6b6fdc56-d9da-477f-b9ea-86f3493bae42",
  "result": "some-string-payload"
}'

Fail task

curl --request POST \
  --url http://localhost:8080/api/task/fail \
  --header 'Content-Type: application/json' \
  --data '{
	"task_id": "Task-6b6fdc56-d9da-477f-b9ea-86f3493bae42"
}'

Cancel task

curl --request POST \
  --url http://localhost:8080/api/task/cancel \
  --header 'Content-Type: application/json' \
  --data '{
	"task_id": "Task-6b6fdc56-d9da-477f-b9ea-86f3493bae42"
}'

Timeout task

curl --request POST \
  --url http://localhost:8080/api/task/timeout \
  --header 'Content-Type: application/json' \
  --data '{
	"task_id": "Task-6b6fdc56-d9da-477f-b9ea-86f3493bae42"
}'